fix license badge GHRexplore

Author: Carles Milà

docs/GHRexplore/GHRexplore.qmd

@@ -10,7 +10,7 @@ format:
 ```
 
 <!-- badges: start -->
-[![License](https://img.shields.io/badge/License-AGPL_v3-brightgreen.svg?style=flat)](https://www.gnu.org/licenses/agpl-3.0.html)
+[![License](http://img.shields.io/badge/license-GPL%20%28%3E=%202%29-brightgreen.svg?style=flat)](http://www.gnu.org/licenses/gpl-2.0.html)
 [![CRAN status](https://img.shields.io/cran/v/GHRexplore)](https://cran.r-project.org/package=GHRexplore)
 <!-- badges: end -->